mxpi_imagedecoder

Decodes images. Currently, only the JPG, JPEG, and BMP formats are supported.

Asynchronous

• Maximum resolution of the JPG/JPEG input image: 8192 x 8192
• Minimum resolution of the JPG/JPEG input image: 32 x 32
• There is no resolution restriction on BMP input images or in the OpenCV mode.
• widthStride of the output image after alignment:
  • Atlas 200/300/500 inference product: The decoding plugin automatically rounds up the input width to the nearest multiple of 128.
  • Atlas 200I/500 A2 inference product: The decoding plugin automatically rounds up the input width to the nearest multiple of 128.
  • Atlas inference product: The decoding plugin automatically rounds up the input width to the nearest multiple of 64.
• heightStride of the output image after alignment: The decoding plugin automatically rounds up the input height to the nearest multiple of 16.

mxpi_imagedecoder

• Input: buffer (data type: MxpiBuffer)
• Output: buffer (data type: MxpiBuffer), metadata (data type: MxpiVisionList and MxpiObjectList)

• Static input: {"image/jpeg"}
• Dynamic output: {"image/yuv","metadata/object","image/rgb"}

For details, see Table 1.

deviceId

Device ID, which is specified by the deviceId property in the stream_config field. You do not need to set the ID.

No

Yes

imageFormat

Format of the image to be decoded. The default format is JPG.

• The Ascend mode supports JPEG, JPG, and BMP.
• The OpenCV mode supports JPG, JPEG, BMP, and other formats.

Yes

Yes

cvProcessor

No

Yes

outputDataFormat

When the OpenCV mode is used and the input image format is bmp, the output image data type can only be BGR or RGB.

• When the OpenCV mode is used for decoding, BGR data is output by default after image decoding. You can change the output data to RGB data by using this property.
• For BMP images, they are output as BGR data. You can change the output data to RGB data by using this property.
• When the Ascend mode is used for decoding, JPEG and JPG images are decoded and output as YUV data. In this case, this property cannot be configured.

No

Yes

dataType

Type of the decoded data. The default value is uint8. It can also be set to float32, which is valid for the OpenCV processing method.

No

Yes

formatAdaptation

CSC function, which decodes images into BGR888 format. The value is a string. The default value is off. Set this parameter to on when enabling the CSC function. (Currently, this function is supported only on the Atlas inference product. The resolution of the input image must range from 32 x 32 to 4096 x 4096.)

No

Yes

handleMethod

Reserved property. Use cvProcessor.

Processing method:

• ascend (default)
• opencv

No

Yes